CN106862459B - With the prestressed composable mold of longitudinal multilayer - Google Patents
With the prestressed composable mold of longitudinal multilayer Download PDFInfo
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- CN106862459B CN106862459B CN201710175047.5A CN201710175047A CN106862459B CN 106862459 B CN106862459 B CN 106862459B CN 201710175047 A CN201710175047 A CN 201710175047A CN 106862459 B CN106862459 B CN 106862459B
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- cavity plate
- prestressed
- cavity
- prestress
- longitudinal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
Abstract
The invention discloses one kind to have the prestressed composable mold of longitudinal multilayer, cooperatively forms prestressed prestressed members different along cavity plate genesis analysis including the cavity plate with blank forming cavity and from cavity plate；Using longitudinal layered prestressed structure, different prestressing force can be generated and then be longitudinally formed different prestress distributions in cavity plate, stress amplitude distribution is adjusted upward by vertical, it being capable of stress distribution on active balance vertical direction, and then resistance of deformation suffered by female die for forming is better balanced, stress suffered by cavity plate is more effectively reduced, the service life of mold can be preferably extended.
Description
Technical field
The present invention relates to a kind of forging molds, in particular to a kind of to have the prestressed composable mold of longitudinal multilayer.
Background technique
For techniques such as cold forging, cold extrusion, powder metallurgy, due to shaping at room temperature, blank deformation drag is huge, mold
The pressure that mold cavity surface is born is high, and common monolithic construction mold is easily cracked to be caused to destroy, and therefore, in engineering commonly uses pre-
Stress composable mold plays the role of extending die life by being provided with multilayer prestress annular on the outside of mold.Prestressing force
It is radially and tangentially both direction in die horizontal face, the vertical plane inner punch direction of extrusion is longitudinal.The multilayer of the prior art is pre-
The mould structure of NOL ring, multilayer prestress annular are radially in concentric loop structure in the horizontal plane.This prestressed structure shape
Formula increases radial prestressed size, has delayed the service life of mold to a certain extent.However, for some shapes along vertical
Direction transition violent forging or extrusion, blank to answer suffered by wall of die cavity to the reaction force of mold cavity
Power size has a long way to go along longitudinal direction, and the prestress annular of longitudinal monoblock type can not stress distribution on active balance vertical direction.
Therefore, it is necessary to one kind to have the prestressed composable mold of longitudinal multilayer, can generate different prestressing force, by vertical
The adjustment of upward stress amplitude distribution, can stress distribution on active balance vertical direction, and then it is recessed that forming is better balanced
Resistance of deformation suffered by mould more effectively reduces stress suffered by cavity plate, can preferably extend the service life of mold.
Summary of the invention
In view of this, the purpose of the present invention is to provide one kind to have the prestressed composable mold of longitudinal multilayer, can produce
Raw different prestressing force, by the adjustment of longitudinal upper stress amplitude distribution, can stress distribution on active balance vertical direction,
And then resistance of deformation suffered by female die for forming is better balanced, stress suffered by cavity plate is more effectively reduced, can preferably be extended
The service life of mold.
Of the invention has the prestressed composable mold of longitudinal multilayer, including cavity plate and and cavity plate with blank forming cavity
Cooperatively form prestressed prestressed members different along cavity plate genesis analysis；
Further, the prestressed member is multiple prestress annulars along the longitudinal layered setting in cavity plate outer surface；
Further, the prestress annular and cavity plate interference fit are arranged；
Further, multiple prestress annulars are different from the magnitude of interference of cavity plate cooperation respectively；
Further, the material of the multiple prestress annular is different；
Further, the multiple prestress annular material can be respectively one of 45 steel, D2 mould steel, hard alloy；
Further, the multilayer annulus knot with the prestress annular of cavity plate cooperation radial radially concentric circles in the horizontal plane respectively
Structure；
Further, the prestress annular inner shape and cavity plate outer shape are adapted；
It further, further include the extrusion cylinder with blank inner cavity being set on concave die cavity, the blank of the extrusion cylinder
Inner cavity is connected to setting with concave die cavity.
Beneficial effects of the present invention: of the invention has the prestressed composable mold of longitudinal multilayer, using longitudinal layered
Prestressed structure can generate different prestressing force and then be longitudinally formed different prestress distributions in cavity plate, by longitudinal direction
Adjust stress amplitude distribution, can stress distribution on active balance vertical direction, and then be better balanced suffered by female die for forming
Resistance of deformation, more effectively reduce cavity plate suffered by stress, can preferably extend the service life of mold.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples:
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram of multiple prestress annulars of the invention；
Fig. 3 is concave die cavity the schematic diagram of the section structure.
Specific embodiment
Fig. 1 is the structural diagram of the present invention；Fig. 2 is the structural schematic diagram of multiple prestress annulars of the invention；Fig. 3 is recessed
Model cavity the schematic diagram of the section structure；As shown in the figure: the present embodiment has the prestressed composable mold of longitudinal multilayer, including has
The cavity plate 4 of blank forming cavity and prestressed prestressed members different along 4 genesis analysis of cavity plate are cooperatively formed from cavity plate 4；" cavity plate is vertical
To " referring to the direction parallel with blank forming cavity, the prestress annular of the prior art is entirety in the vertical direction, it is in the longitudinal direction
Magnitude of interference size it is almost the same, so stress amplitude is non-adjustable along longitudinal direction for the prestressing force that internal layer cavity plate 4 is applied
Whole；Fig. 2 is the schematic diagram of longitudinal layered prestressed structure.For the 4 type chamber of cavity plate shown in Fig. 3, in forming process, fillet
Stress suffered by area A and B is maximum, and stress suffered by chamfered region is small, so that the stress amplitude difference being distributed along longitudinal direction is very big.Cause
This, is substantially divided into 4 regions by longitudinal upper stress distribution size, each region is arranged different prestress annulars, with
The different size of prestressing force that this acquisition is distributed along longitudinal direction more has so that resistance of deformation suffered by female die for forming 4 be better balanced
Effect ground reduces stress suffered by cavity plate 4.Therefore, the present invention is by prestressed member, and the different prestressing force generated by level are recessed
Mould 4 is longitudinally formed different prestress distributions, can stress distribution on active balance vertical direction, and then forming is better balanced
Resistance of deformation suffered by cavity plate 4 more effectively reduces stress suffered by cavity plate 4, can preferably extend the service life of mold.
In the present embodiment, the prestressed member is multiple prestress annulars along the longitudinal layered setting in 4 outer surface of cavity plate (as schemed
Prestress annular (5,6,7,8) in 1)；A single prestress annular is arranged radially relative to cavity plate 4, cavity plate 4 it is longitudinal (relative to
It is tangential in horizontal plane) on form the multilayer cyclic structure that is made of multiple prestress annulars, and every layer of prestress annular is with relatively solely
Vertical formal distribution is in 4 outer surface of cavity plate, that is to say, that in forging process, the prestressing force that cavity plate 4 is subject to is respectively by longitudinal direction
Every layer of prestress annular generate.Number and subdivision the position stress according to suffered by cavity plate 4 in forming process of prestress annular are determined
Fixed, finite element analysis molding by extrusion can get stress distribution suffered by cavity plate 4, in this, as the installation warrants of prestress annular.
In the present embodiment, the prestress annular (5,6,7,8) and the interference fit of cavity plate 4 are arranged；By prestress annular (5,6,7,
8) 4 outer surface of cavity plate is socketed on after heating, prestress annular is just fixed on cavity plate 4 after cooling.
In the present embodiment, multiple prestress annulars (5,6,7,8) are different from the magnitude of interference that cavity plate 4 cooperates respectively；To on longitudinal direction
Each different prestress annular sets different magnitude of interference, and the magnitude of interference between each ring and cavity plate 4 is in different size, in this way with it is recessed
The flexible deformation that mould 4 generates after assembling is different, also just produces different prestressing force, to realize longitudinal upper stress amplitude point
The adjustment of cloth, magnitude of interference size are determined by the stress acted on 4 inner wall of cavity plate.
In the present embodiment, the material of the multiple prestress annular (5,6,7,8) is different；The prestress annular of the prior art is one
A entirety, used in material be homogeneous material, can not realize change design of material in the longitudinal direction, cannot substantially effectively utilize material
Therefore the intensity surplus of material in the present embodiment, can be used different materials to each prestressing force and manufacture, different materials
With different elasticity modulus, this but also being assembled from cavity plate 4 after the flexible deformation that generates it is different, to realize longitudinal different
Prestress distribution.This realize in the longitudinal direction becomes design of material, can substantially effectively utilize the intensity surplus of material.
In the present embodiment, the multiple prestress annular material (5,6,7,8) can close respectively for 45 steel, D2 mould steel, hard
One of gold；Setting magnitude of interference of different sizes can also be passed through and combined and select different mold materials, pre- answered so that each
Flexible deformation of different sizes is generated between 4 contact surface of power ring and cavity plate, to generate the different prestressing force being distributed along longitudinal direction.
In the present embodiment, the prestress annular (5,6,7,8) cooperated respectively with cavity plate 4 is radial radially concentric in the horizontal plane
Round multilayer circular ring structure；It is in concentric loop structure, this prestressing force that multilayer prestress annular (5,6,7,8) is radial in the horizontal plane
Structure type increases radial prestressed size, has delayed the service life of mold to a certain extent, has realized in horizontal direction
Prestressing force radially reinforces and longitudinal prestressing balance.
In the present embodiment, prestress annular (5,6,7, the 8) inner shape and 4 outer shape of cavity plate are adapted；So that pre-
The balance of stress and resistance of deformation is more uniform, greatly reduces stress amplitude fluctuation, to extend the tired of 4 entirety of internal layer cavity plate
The labor service life.
It further include the extrusion cylinder 3 with blank inner cavity being set on 4 type chamber of cavity plate, the extrusion cylinder 3 in the present embodiment
Blank inner cavity be connected to setting with 4 type chamber of cavity plate；The present invention by formed punch 1, blank 2, extrusion cylinder 3, cavity plate 4, prestress annular (5,6,
7,8) it forms；Wherein prestress annular (5,6,7,8) is respectively interference fit with cavity plate 4, and the magnitude of interference between each ring and cavity plate 4 is big
Small different, size is determined by the stress acted on 4 inner wall of cavity plate；Mold materials used in prestress annular (5,6,7,8)
It can respectively specify that, specific selection is determined according to required prestressing force size to be offered, general optional 45 steel, D2 mould steel, hard
Alloy etc..Its working principle is that: press machine upper table face moves straight down, drive formed punch 1 move downward, to blank 2 into
Row squeezes, and blank is in 4 internal shaping of cavity plate.Prestress annular (5,6,7,8) is respectively interference fit with cavity plate 4, by the way that size is arranged
Different magnitude of interference and the mold materials different by selection, so that being generated between 4 contact surface of each prestress annular and cavity plate
Flexible deformation of different sizes, to generate the different prestressing force being distributed along longitudinal direction.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (4)
1. one kind has longitudinal prestressed composable mold of multilayer, it is characterised in that: including with blank forming cavity cavity plate and
It is vertical along cavity plate outer surface for cooperatively forming from cavity plate along prestressed member described in the different prestressed prestressed members of cavity plate genesis analysis
To multiple prestress annulars of layering setting, a single prestress annular is arranged radially relative to cavity plate, cavity plate it is vertical be upwardly formed by
The multilayer cyclic structure of multiple prestress annulars composition, and every layer of prestress annular with relatively independent formal distribution in cavity plate appearance
Face；The multiple prestress annular, which is interference fitted respectively from cavity plate with different magnitude of interference, to be arranged, the material of the multiple prestress annular
Material is different.
2. according to claim 1 have longitudinal prestressed composable mold of multilayer, it is characterised in that: the multiple pre- to answer
Power ring material can be respectively one of 45 steel, D2 mould steel, hard alloy.
3. according to claim 2 have the prestressed composable mold of longitudinal multilayer, it is characterised in that: the prestress annular
Inner shape and cavity plate outer shape are adapted.
4. having the prestressed composable mold of longitudinal multilayer according to right 1, it is characterised in that: further include being set to cavity plate
The extrusion cylinder with blank inner cavity on type chamber, the blank inner cavity of the extrusion cylinder are connected to setting with concave die cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710175047.5A CN106862459B (en) | 2017-03-22 | 2017-03-22 | With the prestressed composable mold of longitudinal multilayer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710175047.5A CN106862459B (en) | 2017-03-22 | 2017-03-22 | With the prestressed composable mold of longitudinal multilayer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106862459A CN106862459A (en) | 2017-06-20 |
| CN106862459B true CN106862459B (en) | 2019-07-23 |
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| CN201710175047.5A Active CN106862459B (en) | 2017-03-22 | 2017-03-22 | With the prestressed composable mold of longitudinal multilayer |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108760515B (en) * | 2018-04-27 | 2020-09-08 | 中国石油天然气股份有限公司 | Experimental system and method for testing crack height expansion by loading stress |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004283881A (en) * | 2003-03-24 | 2004-10-14 | Tostem Corp | Die for aluminum extrusion and aluminum extruded section thereof |
| CN2741686Y (en) * | 2004-10-21 | 2005-11-23 | 长江大学 | Slope end surface cold extruding combined concave mold |
| JP2006334622A (en) * | 2005-06-01 | 2006-12-14 | Nippon Tungsten Co Ltd | Metallic die and its usage |
| CN204657375U (en) * | 2015-05-05 | 2015-09-23 | 湖州哈特贝尔精密锻造有限公司 | Cold extrusion combined die |
| CN105537485A (en) * | 2016-01-14 | 2016-05-04 | 上海久进精密锻造有限公司 | Steering shaft forming die and forming technology |
| CN206632283U (en) * | 2017-03-22 | 2017-11-14 | 重庆交通大学 | Longitudinal split prestressing force forging mold |
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| CN106862459A (en) | 2017-06-20 |
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